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Plenum/Runner bolt location

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Old Nov 9, 2009 | 10:26 AM
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rdowens91z's Avatar
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Plenum/Runner bolt location

Hey guys, minor issue im replacing my fuel injectors/FPR and i didnt pay attention to where each of the different length bolts went into the runners and plenum. Does anyone have a diagram of where each bolt goes or know off the top of their head? Info would be greatly appreciated!
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Old Nov 9, 2009 | 02:00 PM
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300hpse's Avatar
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From: Englewood, CO
Car: 1990 Trans Am
Engine: Lb9
Transmission: factory T5
Axle/Gears: 3.08 limited slip
Re: Plenum/Runner bolt location

I don't remember specifically but I just did the same thing. If you look at your runners and the bolt holes, you'll see the flange where the bolt holes are located vary in size (2 different thicknesses). The longer bolts go in the thicker flanges and the shorter ones go in the thinner flanges (the holes for the smaller bolts have a more machined look to them). I believe the shorter bolts only go in the holes for the runners to lower manifold and there's only a few of them. All of the plenum bolts, about half of the lower bolts and then the 2 opposing (1 per runner) bolts that go in from the inside of the lower manifold are all longer bolts.

Are there more than 2 sizes? I can't say my memory is perfect on this.
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